The IGI on www.familysearch.org is the best place to start. You'll find what appears to be his marriage in Gamlingay in 1848.
Cambs FHS has an excellent site at http://www.cfhs.org.uk/Search.html which includes a baptism index, but I can't see him there although there are other Sear baptisms in the parish at about the right time*
Regards
David
*There are more baptisms indexed as Seer on both the IGI and the Baptism Index. He appears to be Edmund Seer - as he was in 1851 - not Edward
Potton PR has been extracted onto the IGI - like Sears/Sear/Seer you may need to try alternative spellings - eg Almond
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Census information is Crown Copyright, from www.nationalarchives.gov.uk Beds: Cople: Luke/Spencer Everton: Hale Henlow: Cooper/Watts/Sabey Potton: Merrill Southill: Faulkner/Litchfield/Sabey Woburn/Husborne Crawley: Surkitt Hunts: Gt Gransden: Merrill/Chandler/Medlock Toseland: Surkitt/Hedge/Corn Cambs: Bourn: Bowd Eltisley: Medlock Graveley: Ford/Revell